Container



Septa i2, 1.939. 1 BCALVA ET AL 2,172,864

CONTAINER Filed Jan. 14., 1935 Patented Sept. 12,y 1939 UNITED STATES CONTAINER Jose B.- Calva, St. Paul, and Thomas F. Barnes, Minneapolis, Minn., assignors to Waldoril Paper Products Company, a corporation of Minnesota Application January 14, 1935, serial No. 1,638

1 Claim.

containers, particularly adaptable for containing liquids such as oils and the like. These containers are suitably coated to resist any damaging eiiects, either to the container or to the contained liquid. In preferred form, our containers are provided ywith opposed transparent portions, by means of which the contents of the liquid may be observed.- It is a'feature of the preferred form of our container to provide opposed sight windows in the container through which the ordinarily semitransparent or translucent contents of the container may be readily observed. While it is known that containers having transparent portions have been used previously, we believe that the provision of these portions in opposed relation in combination with containers for liquids is novel. Furthermore, the provision of such windows in a container designed to accomodate liquids necessitates making the windows both liquid-proof and ain-proof, so that the contents may not leak out, and soy that the liquids may not be permitted to deteriorate from contact with air or cannot oxidize.

In the case of oily products, suitable grease- These and other objects and novel features of4 our invention will be more clearly and fully set forth in the following specification and claim. 40 t In the drawing forming a part of our specificaion: l

Figure 1 illustrates a side elevation View of a container formed in accordance with our invention. 45 Figure 2 is a cross-sectional view on the line 2 2 of Figure 1, illustratingthe manner in which the sight windows may be formed oppositely disposed therein.

Figure 3 is an enlarged cross-sectional view of 50 a sight window, illustrating a manner in which the window is secured in the container.

yFigure 4 is a view similar to Figure 3, illustrating another form of connecting means between the transparent window and the container. 55 Figure 5 illustratesv another view similar to (Cl. G-44) Our invention relates to an improvement in Figure 3, showing another form of connector between the sight window andthe container.

Figure 6 is a cross-sectional view through the vtop of another form of container, illustrating the manner of securing the sight window ln the 5 top, bottom, or ilat side of a container.

Figure '7 is a perspective view, partly in section, showing the sight window illustrated in Figure 6, and the manner in which the window is attached.

Our container A may be of any shape found most suitable for the described purpose. We have shown, for the purpose of illustration, a cylindrical carton; and while 4we have designed this carton for formation as a container made of l5 cardboard or laminated paper of some sort, we wish to point out that fiber or a metallic wall formation, or combinations of such various matrlals, may be used if found desirable.

Windows III are formed in the container either 20 during the formation of the walls, or after they have been completed. These windows I0 are shown in Figures l through 5 in opposed relation in the side wall portion .Il of the container A, and in Figures 6 and 7 we illustrate a window I0 25 formed in a top or bottom I2 or I3 or side of the container. It is understood that the windows I0 are preferably provided in pairs, and each window I0 .is provided with an oppositely disposed wing dow.

Either during the process of manufacture, or upon the completion of the container, the side walls II, top I2, and bottom I3 are coated with an inner coating I4 and preferably with anouter coating I5. This coating may be a grease-proofing substance, a water-proofing substance, or a combination grease and Water-proofing substance.

-The window which forms the sight opening may be formed of transparent sheeting material 40 such as regenerated cellulose illms and rubber derivatives. Such sheeting may be, for example, cellulose hydrate such as Cellophane and the like, sheeting made of cellulose esters such as cellulose acetate, cellulosenitrate and the like; sheetings made of cellulose ethers such as ethyl cellulose, benzyl cellulose and such materials; and also sheeting materials made of albuminoid materials such as glue, casein, albumin and the like.

Each oi. the sheeting materialsv mentioned above are given as the principal ingredient forming the film constituent of a suitable mixture which may be formed by resins, plasticizers, solvents, and the like to produce a nlm possessing edge of the wall of the container.

With particular reference to the drawing. we will now describe the manners in which the windows It may be secured in position in the container. Figure 1. and Figure 2 which is a section on the line 2-2 of Figure l, disclose the manner in which windows il are positioned in opposed relationship, so that when the container A is interposed between the eye and a source of light the transparent or semi-transparent liquids within the container may be observed. It is obvious that these windows may also be oppositely disposed in the ends of the container if desired, as suggested in Figures 6 and 7 of the drawing; While but one end of the container is shown in each of these figures, it is to be understood that the ends may be similarly formed, and the contents may be viewed through the container longitudinally as well as .transversely as in Figure l. r In Figure 3 we disclose a window Il which is inserted in a gasket formed of a soft material which may be readily bent to form a frame extending about the periphery of the window. The

transparent sheeting I is held in position between a pair of flanges i1 and Il, while flanges I9 and 20 on the outside of the frame contain the This form oi window may be insertedl into a container A having a window opening of proper size and shape after the sheeting i6 has been inserted in place in the frame by leaving one flange I9 or 20 extending in alignment with the body portion 22 of the frame, and bending this ange into the position shown after the frame is in position. In this manner, the` frame is forced tightly into con# tact with both the sheeting i6 and with the wall il to form a liquid-proof connection.

In Figure 4 we disclose a slightly different form of frame for the window I0. In this modification, the sheeting Il is engaged between the opposed sides of a U-shaped sheet metal channel having side flanges formed integrally extending from the open ends of the channel and bent back in finished formation into substantially parallel relationship with each other and with the sides of the U-shaped channel. Figure 4 clearly shows the U-shaped channel 24 andlflanges 2l and 26 integrally secured thereto. As in the form illustrated in Figure 3, the frame of Figure 4 may be attached in the opening oi' a formed carton by crimping either the flange 25 or the flange 26 into engagement with the side Wall il of the container after the frame and enclosed sheeting 23 is positioned in the window opening.

Figure discloses another type of securing means for the window i0. In this modiilcation,

the sheet material forming the transparent window, designated as 21, is secured in position by a sheet metal frame 2l which is substantially 8shaped in crosssection. Two separate channels an thus formed; one of` which comprises opposed side members 2l and Il between which is crimped the transparentsheet 21. The connected opposed side members ll and 22 are adapted to enclose the adjacent portion of the side wall Ii. Obviously, either the frame can be inserted in the window opening in the side wail li and the sheet 21 then inserted m position, or the window pane 21 may be secured in the frame and the assembled window then crimped into position to engage the sigle wall Ii.

The window construction illustrated in Figures 6 and 'l is particularly adapted for use with a laminated container made up of three or more layers ot material, designated respectively I2, 2l and Il. 'Ihe center lamination 34 is provided with an opening which is Just the same size, or very slightly larger than, the transparent sheet 3l. I he laminations 22 and ll are provided with corresponding openings 21 and il, respectively, which, however. are `slightly smaller than the opening in the lamination 84, or than the transparent sheet Il. Accordingly, when the laminations are secured together, the sheet 36 is substituted for the material cut from the opening in the lamination u, and the laminations 33 and 35 overlap the sheet 36 and are secured marginally thereto by an adhering means, forming a tight joint.

While we have particularly described our construction as having opposed windows, we desireto have it understood that the use of a single window applied in any manner such as has been described is also a part of our invention.

In accordance with the patent statutes, we have described the principles of our invention, and while we have endeavored to set forth the best embodiments thereof, we desire to have it understood that this' is only illustrative of a means of carrying out our invention, and that obvious changes may be made within the scope of the following claims without departing from the spiritof our invention.

We claim:

A container for liquids in combination with a filling of semi-transparent liquid, including "a substantially cylindrical body of opaque material, and a pair of relatively small opposed sight windows in said body through which a relatively small amount of the liquid may be observed, said windows positioned so that light rays entering one window may be observed through the other window.

, JOSE B. CALVA.

THOMAS F. BARNES. 

